Supply Planning not alingn to the calendar setting where Monday is defined as the first working day

Summary:

We would like to bring to your attention an issue we are facing with the start dates in Supply Planning. The calendar is defined such that the first working day should always fall on a Monday. However, while checking, we have observed that the start dates are not aligning as expected with the calendar setup. For example, the following dates are not starting on Monday as defined:

 10.01.2025

 

01.01.2026

 

04.01.2026

 

05.01.2026

 this is not the first time we are attempting this process. We have run it previously as well, but the only change we made in this scenario was to define the first working day as Monday.